I'm building a milk pasteuriser.
The milk in the cooling tank has a starting temperature of 4°C. It should then be heated to 72°C for 30 sec, then cooled back down again to 4°C as quickly as possible (if I understand the process correctly).
I've got 2 bulk tanks, one with a heating fluid of 90°C and another with cooling fluid of 4°C.
My question is this: What should the length of each of the copper induction coils be to heat/cool the fluid to the appropriate temperature for the required length of time. (I'm looking for a formula if such exists)
**Side note: I'm not an engineer. I'm a home hobbyist with background in maths/programming.